/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lvyh.lightframe.tracer.starter.resttemplate;

import com.lvyh.lightframe.tracer.core.common.AbstractTracer;
import com.lvyh.lightframe.tracer.core.common.SimpleTracerConfiguration;
import com.lvyh.lightframe.tracer.core.samplers.TraceSamplerConfig;
import com.lvyh.lightframe.tracer.resttemplate.plugin.RestTemplateTracerHelper;
import com.lvyh.lightframe.tracer.resttemplate.plugin.interceptor.RestTemplateInterceptor;
import com.lvyh.lightframe.tracer.starter.registry.DynamicBeanRegister;
import com.lvyh.lightframe.tracer.starter.util.SpringContextUtils;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.core.env.Environment;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;

import java.util.Collections;

@Configuration
@Import({DynamicBeanRegister.class})
@ConditionalOnProperty(prefix = "tracer.resttemplate", value = "enabled", havingValue = "true")
public class RestTemplateAutoConfiguration implements EnvironmentAware {
    private static final Logger logger = LoggerFactory.getLogger(RestTemplateAutoConfiguration.class);

    /**
     * Configuration context is the tool to get configuration files
     */
    private Environment env;

    @Bean
    public RestTemplateInterceptor restTemplateInterceptor() {
        TraceSamplerConfig traceSamplerConfig = SpringContextUtils.getBean(TraceSamplerConfig.class);

        AbstractTracer restTemplateTracer = RestTemplateTracerHelper.getRestTemplateTracer(traceSamplerConfig);
        return new RestTemplateInterceptor(restTemplateTracer);
    }

    @Bean
    public RestTemplate restTemplate(RestTemplateInterceptor restTemplateInterceptor, HttpComponentsClientHttpRequestFactory clientHttpRequestFactory) {

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setInterceptors(Collections.singletonList(restTemplateInterceptor));
        restTemplate.setRequestFactory(clientHttpRequestFactory);
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler());
        logger.info("[RestTemplateAutoConfiguration] Init rest template success.");

        return restTemplate;
    }

    @Bean
    public HttpComponentsClientHttpRequestFactory clientHttpRequestFactory() {
        PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager();
        pollingConnectionManager.setMaxTotal(1000);
        pollingConnectionManager.setDefaultMaxPerRoute(1000);

        HttpClientBuilder httpClientBuilder = HttpClients.custom();
        httpClientBuilder.setConnectionManager(pollingConnectionManager);
        httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(1, true));
        HttpClient httpClient = httpClientBuilder.build();

        HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
        clientHttpRequestFactory.setConnectTimeout(5000);
        clientHttpRequestFactory.setReadTimeout(5000);
        clientHttpRequestFactory.setConnectionRequestTimeout(200);

        return clientHttpRequestFactory;
    }


    @Override
    public void setEnvironment(Environment environment) {
        this.env = environment;
        SimpleTracerConfiguration.setApplicationName(getApplicationName());
    }

    private String getApplicationName() {
        String applicationName = this.env.getProperty("spring.application.name");
        return applicationName;
    }
}
